class Movie < ActiveRecord::Base
	
	validates_presence_of   :title, :description
  validates_uniqueness_of :title
  validates_length_of     :description, :minimum => 10
  validates_inclusion_of  :rating, :in => %w{ G PG PG-13 R NC-17 }
	
	def appropriate_for_birthdate?(birthdate)
		if %w{ R NC-17 }.include?(rating)
			(Time.now - 17.years) > birthdate
		elsif rating == "PG-13"
			(Time.now - 13.years) > birthdate
		else
			true
		end
	end
	
	def self.find_all_appropriate_for_birthdate(birthdate)
    movies = Movie.find(:all).select {|m| m.appropriate_for_birthdate?(birthdate) }
  end
	
end
